@Kendra43
Has your DP actually set a date to go and cook for his friends? If not in an of itself it's a flippant remark many people make in the course of a work day.
What has made my ears prick up is that he also mentioned a crush in the city you were visiting and how he didn't do anything because he was attached. Bit odd to mention it, was he after an award for being a good boy? Again in and of itself nothing to worry about.
Then he mentions having an immediate connection to one of his new friends .... starting to consider he has something on his mind that's leaking out. Is he trying to push your buttons in some way? Make you jealous or is it something else? Whatever it is he has delivered a dose of instability in your relationship.
Then I spotted this in one of your posts
My main worry is that although he loves me he wants to experience something else. Before me he was in a long marriage and never really had the experiences others did.
WTF does that mean?
On the whole having female friends isn't normally a problem but he is mentioning a couple of odd things around women he has a connection to outside of your relationship and while he loves you he wants to experience something else ... what exactly?
It's not unreasonable to ask what he wants from your relationship. Are you a holiday companion with benefits with or without mutual exclusivity or are you a long term DP where you will be making plans to move closer and spend more time together. Either is fine as a relationship if you are both happy with that but you don't seem terribly happy about any of it.
You don't have to question his friendships with other women but he's making your standing in the relationship unstable and picking at something he possibly knows you might get jealous about. Communication is key in a relationship, it might be nothing or he might as you mentioned in your OP be Testing the Waters for something else.
Either way it is making you doubt yourself, personally I'd ask for a discussion about where this relationship is going and how he sees the future panning out.